HKCEE 2008 paper 1 Q8

Adrian

2009-01-22 12:07 am

There are 625 boys in a school and the number of girls is 28% less than that of boys.
There are 860 local students in the school.
It is given that 80% of the boys are local students. If x% of the girls are also local students, write down the value of x.

1) 唔好比答案我, 我有答案, 我係想問, 如果 local students 裡的 boys 唔係80%, 比如係 70%, 咁幾多 % of girls are local students? 點解? 其實有咩關係?
2) girls is 28% less than that of boys, 對 “幾多% of girls are local students” 有無影響?

回答 (1)

myisland8132

2009-01-22 12:27 am

✔ 最佳答案

先答原問題
男生625人﹐女生450人
本地男生500人
全部本地生860人=>本地女生360人=>佔全部女生80%
1)
如果 local students 裡的 boys 唔係80%, 比如係 70%
即本地男生437.5人(姑且當有0.5人)
接著有條件推到女生860-437.5=422.5人
佔全部女生93.8%!!
關係就是由總本地學生數決定
2)
有因為你要知道全體女生數才可以判定「幾多% of girls are local students」

2009-01-21 18:01:35 補充：
唔係﹐例如90% of the boys are local students已經不同。另外總local students人數不是856人亦會不同

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